<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js" type="text/javascript"></script>
</head>
<body>
    <div id="root">
    姓：   <input type="text" v-model:value="firstName"/>
     <br/><br/>
    名：   <input type="text" v-model:value="lastName"/>
    <br/><br/>
    全名：<input type="text" v-model:value="fullName"/>
     <!-- 以下语句是错误的，v-model只能绑定在表单类元素上
     <h2 v-model:x="name"></h2> -->
    </div>
    <script type="text/javascript" >
        Vue.config.productionTip=false
     const vm=new Vue({
      el:'#root',
      data:{
          firstName:"张",
          lastName:"三"
      },
      computed:{
          //完整写法
          fullName:{
              get(){
                  return this.firstName+"-"+this.lastName
              },
              set(value){
                const arrs=value.split("-")
                this.firstName=arrs[0]
                this.lastName=arrs[1]
              }
          }
          //简写 当确认不需要修改时
          /* fullName(){
            return this.firstName+"-"+this.lastName
          } */
      }
     })
    </script>
</body>
</html>